Drawing roller for spinning machines



May 15, 1928. 1,670,064

U. DITTMAR DRAWING ROLLER FOR SPINNING MACHINES Filed June 18, 1925EHUIHHHHIH mmnu ml;-

Patented May 15, 1928.

- UNITED STATES want UDO DITTMAB, OFHFREIBURG 11v: nnnrssAm-eniamA x.

. I DRAWING ROLLER roa SPINNING MaonrNEs.

' Application filed June 18, 1925, Serial No. 37,963; and inGermany'Jnne2i, ie24.

My invention relates to improvements in ments is to provide meanswherebythe sliver is supported While passing between the sucv Anothercessive pairs of drawing rollers. object of the improvements is 'to'provide Subsidiary drawing rollers intermediate the main drawing rollersfor stretching the sliver, the said subsidiary .drawing rollers beingconnected so as to stretchshort fibres of the sliver and. to permit thepassage of vlong fibres therethrough without drawing the same. Withthese and other objects in view my invention consists in providingsubsidiary pairs of drawing rollers intermediate the main rollers, theworking faces of the said subsidiary rollers being slightly spaced fromeach other so as to permit long fibres to pass between the same withoutbeing drawn, and to stretch only'short fibre material.

For the purpose of explaining the invention "an example embodying thesame has been shown in the accompanying drawings,

in'which the same reference characters have been used in all the viewsto indicate corresponding parts. In'said-drawings,

Fig; 1, is a diagrammatical elevation of the apparatus,

Fig. 2, is a top-plan'view'with rollers removed,

Fig. 3, isa detail'view the subsidiary rollers, and I Fig. 4, is asimilar view showing a modification. I

In the example shown in the figures the apparatus comprises back bottomdrawing rollers a middle bottom drawing rollers b and front bottomdrawing rollers 0 and back top rollers a middle top rollers b and fronttop rollers 0 the bottom rollers being mounted in roller stands p, andthe top rollthe top showing one of ers in cap bars n, as is known in theart.

' Between'the pairs of rollers 0 0 and 6 b In the example shown in thefigures the hotaras? Q FI E" I-wish tobe understood that my 'inven tionrelatively tothe stand by means of a screw '2', lateral displacementofthe said stand it being prevented by'lugs k'depend ing from the saidstand h; The stand it provides a bearing for the subsidiary bottomrollers g and'cl fThe subsidiarytop rollers (Z2 and g p are mounted. on:the cap In Fig. 3 I have shown a roller which can be used either asa-subsidiary bottom roller 9 or d or a subsidiary toprolle'r-al 7 Asshown the said'roller is slightly reduced in diameter at its median orworking part W as compared to-its ends the differencev of thediametersbeing not'morethan a fraction of a millimeter." 'InFig. 4 I have shown amodification in which the working face r of the cylinder'is'providedwith circumferentia'l grooves. Preferably the roller ismounted so that the projecting portions 'between the grooves areslightly spaced ft'ro'm w the cooperating roller. 1 Bythusproviding aslight clearance between the workingfacesof the rollers'the sliver isheld underdight In Fig. 2 I have shown n examplejin which a plurality ofloose bottom'rollers are connected with one another, so that af'continuous series extending-the whole length of the machine is produced.Foreac'h side of such-loose'or connected bottom rollers a common supportmay be provided'on the stand.

I claim 1. In an'apparatus of the class described,

the combination, with two pairs of main drawing rollers, of a pair ofsubsidiary drawing rollers having smooth working faces slightly spacedfrom each other.

2. In an apparatus of the class described,

the combination, with two pairs of main drawing rollers, of a pair ofsubsidiary drawing rollers having smooth working, i

faces, the working face of one of said rollers being reduced in diameteras compared to other portion-s of the roller. H

3. A drawing apparatus for spinning ma-.

chines, including a plurality of pairs of main drawing rollers, and anauxiliary air of rollers within the stretching Zone etween two adjacentpairs of said main drawing rollers, one ofsaid auxiliary'roll'ers havingits end portions Contacting with the other auxiliary roller whereby oneis frictionally driven from the other andhaving its intermediate portionsmooth and of slightly smaller diameter. 7 Y i 4. A drawing apparatusfor spinnin machines, including'two pairs'of main raw- 'flO ' chines,including a plurality of. drawing ingrollers, and an auxiliary pair ofrollers therebetween, said auxiliary rollers. having their end. portionsin frictional driving en ga'gement and their intermediate portionssmooth and slightly spaced apart.

5. A drawing apparatus for spinning ma.- chines, including a pluralityof drawing rollers arranged to form a stretching 'zone, certain ofsaidrollers being arranged in pairs, to 'grip and stretch-the sliver passingtherebetween, and certain of said rollers be-, ing arranged in pairs topermit slippage of the sliver.

chines, including a plurality of .drawing.

rollers, two of said rollers having their surfaces acting; to grip thesliver passing therebetween, and two of said rollers having their;working surfaces'slightly spaced, and means for driving one of saidsecond mentioned rollers from one of said first mentioned rollers. g 1 I[8. *A drawing apparatus for spinningniachines, including a pluralityof.drawing rollers, two of said rollers-having their surfaces acting togrip the, sliver passingtherd between, and two of said rollers havingtheir working surfaces "slightlyspaced, anda belt for driving one ofsaid second inentionedrollers from one of'said first mentioned rollers.r q

9. A drawing apparatus for spinning mashines, including two pair's'ofdrawing rollers having their surfaces coacting to form a stretching'zone'betwe'en said pairs, and an intermediatepair of stretchingrollers, one

of said intermediate rollers having its working surface slightly spacedfrom the other, and a belt fordriving one of said intermediate rollersfrom one of saidffirstmentioned rollers. v

10, A drawing apparatus for spin'ningmachines, includinga stand,aplurality of lower main stretching rollers mountedthereon,

' an auxiliary member serving to retain Said rollers in position, lowerauxiliary rollers mounted in said member, a pivoted cap bar having uppermain rollers for cooperating with'saidlower main rollers and also chav-'ingupper auxiliary rollers for cooperating with said lower auxiliaryrollers, and means for driving saidlower auxiliary rollers from a,

said lower main rollers. v I g '11. A drawing apparatus for s inning machines, including a stand, a plura ity of lower 'main stretching rollersmounted thereon,

an auxiliary member serving toretain said rollers in position, lowerauxiliary rollers mounted in said member, a pivoted cap bar having uppermain rollers i'or cooperating with said lower main rollers and alsovhaving upper auxiliary rollers for cooperating with said lowerauxiliary rollers, and means for driving said lower 'auxiliaryrollersfrom said lower main rollers each of said-upper rollers being'f-rietion'ally driven from its corresponding lower roller, and one ofeach pair of auxiliary rollers having its working surface slightlyspaced fromtheworkin'g surface of the cooperating auxiliary roller.-

In-testimony whereof- I havejaffixedj my signature. 7 it UDo DITITMAR.

